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Ling Yang & Robert Pelton
McMaster University
Fraser McLellan & Martin Fairbank
Abitibi-Consolidated Inc.
The objectives of this work were to understand why fluorochemicals, added to retard solvent of grease penetration, are more effective in wood-free papers than in mechanical pulp-based papers. Newsprint required about 10 times more fluorochemical than did Whatman #42 filter paper to achieve solvent resistance. Based on results of kit tests, contact angle measurements and X-ray photoelectron spectroscopy using both paper and regenerated cellulose films, it was concluded that about 40% of the added fluorochemical demand of newsprint, compared with filter paper, was due to the higher specific surface area of newsprint. The remaining 60% was due to interference by solvent extractable material (i.e. pitch). The negative effects of pitch could be partially circumvented by using hydrophobically modified starch in conjuctiion with the fluorochemical.
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Factors Influencing the Treatment of Fluorochemicals for Oil Repellancy